An analytical model for dissolution of deposited asphaltene during CO2 injection from the porous media

Jonggeun Choe, Ilyas Khurshid
  • International Journal of Oil Gas and Coal Technology, January 2018, Inderscience Publishers
  • DOI: 10.1504/ijogct.2018.10014389

Removal of formation damage due to Asphlatene

What is it about?

In this study, an analytical model is derived for the dissolution of deposited asphaltene. The derived model is used to develop a simulator that solves the dissolution of deposited asphaltene from the porous media. The results of the derived model are matched with the laboratory results and find the important parameters that may lead to asphaltene dissolution. Our results shows that asphaltene dissolution is affected by asphaltene concentration and its solubility, properties of host rock (heterogeneities), force of adhesion, and CO2 injection rate and period. The model doesn’t consider CO2-rock chemical reactions in porous media. However, its consideration can increase reservoir porosity and permeability.

Why is it important?

• Pressure depletion, phase separation, composition change, and CO2 injection may shift equilibrium conditions leading to asphaltene deposition • It is found that asphaltene can be re-dissolved at certain conditions or levels of MMP • An analytical model and a simulator is developed to describe the re-dissolution of asphaltene


Dr Ilyas Khurshid
Khalifa University of Science Technology and Research

• It is observed that asphaltene re-dissolution depends on asphaltene concentration and its solubility, CO2 injection flow rate and period, and reservoir heterogeneity • The developed model helps to determine the rate and amount of CO2 that should be injected in a reservoir to recover maximum oil.

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The following have contributed to this page: Dr Ilyas Khurshid